Original SkyRC SK-500002 High Precision GPS Speed Meter for RC FPV Multirotor Quadcopter Airplane Helicopter Compact and easy to carry;Speed meter with top speed memory. Top altitude;GPS Coordinator;Built-in 4M flash (recording time: 6 hours). UTC timestamp logged for each track point;Built-in rechargeable, LiPo battery 200mAh (Operating time: 150 minutes). Support both Metric and Imperial system of measurements. PC link for data logging & google map;Firmware upgradable.